Buderus Logamatic 2107 Applications Manual

Applications Manual

Logamatic 2107 Controls

Modular control system for

Buderus ﬂ oor standing boilers with

indoor reset, outdoor reset, mixed zones,

and solar DHW capability

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018

Technical speciﬁ cations are subject to change without prior notice

Applications manual

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018 Technical speciﬁ cations are subject to change without prior notice

Table of Contents

1 Introduction 4

2 Terms 5

3 Control Programming 7

4 Installation of the Logabracket 9

5 Setting Parameters 10

6 Troubleshooting 12

7 Description of Wiring Terminals 17

8 Application Drawings 20

9 Burner/Boiler Wiring 52

10 Multi-zone Relay Controls 64

11 Mixing 67

12 Tables/Formulas 70

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018

Technical speciﬁ cations are subject to change without prior notice

1 Introduction

This manual addresses some of the many applications that are

possible using Buderus outdoor reset controls. Applications

depicted in the manual are presented with both hydraulical and

electrical outlines. The drawings contained in this manual are

intended to be used as an aid to system installers and

designers and are conceptual in nature. Auxiliary equipment

depicted in this manual does not necessarily represent any one

particular manufacturer or speciﬁ c model number. There are a

wide variety of techniques, practices and piping arrangements

possible with hydronic heating systems and it is the

responsibility of the installing contractor to determine which of

these is best suited for a speciﬁ c application.

In an eﬀ ort to simplify electrical drawings, they have been

limited to zone controlling only (space heating and DHW). Other

constants such as power input, boiler sensor and outdoor

sensor wiring have also been eliminated. Information for wiring

of burners can be found in section 9 of this manual. Further

information can be found in the control service manual.

Although this manual covers many common applications for our

equipment, the possibilities are virtually endless. Should you

encounter an application that is not covered in this manual or

have questions regarding any of its content, we encourage you

to contact us here at Bosch Thermotechnology Corp.

Bosch Thermotechnology Corp. reserves the right to make

changes without notice due to continuing engineering

and technological improvements .

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2 Terms

Outdoor Reset: Outdoor reset is a control method that takes

outdoor air temperature into consideration when determining the

system water temperature. Instead of a ﬁ xed high limit

temperature (i.e. 180°F (82°C)), the high limit is reset to a

temperature high enough to satisfy the heat loss at any given

outdoor temperature.

In designing a heating system the ﬁ rst requirement is an accurate

heat loss calculation. Several factors are used in determining heat

loss; the volume of space being heated, type of materials being

used in construction, insulation values and a design temperature.

The design temperature represents the coldest day of the year.

The heat loss calculation is then used to determine the output

requirements for the boiler, baseboard, panel radiators, etc. In

short the system is sized to heat the house on the coldest day of

the year.

However, a building‘s heat loss is ever changing; and is largely

dependent on outdoor temperature. As the outdoor temperature

drops, the heat loss increases and as it rises the heat loss

decreases. The fact is that approximately 98% of the heating

season the boiler and radiators are oversized. With

outdoor reset controlling you can more accurately match the

output from the heating system to the current heat loss. For

example, it may require 180°F (82°C) water temperature

circulating through the system in order to have enough output to

maintain a 70°F (21°C) indoor temperature on a 10°F (-12°C) day.

Yet, at a 40°F (5°C) outdoor temperature it may only require

135°F (57°C) water temperature to satisfy the heat loss. By

resetting the system water temperature, a lower average water

temperature is used throughout the heating season and maximum

temperature is used only on the coldest days of the year.

Among the many beneﬁ ts to this type of controlling is optimum

fuel economy. By only heating the water to the minimum

temperature needed, fuel economy is maximized (as much as

30% in fuel savings!). Lower standby losses during “oﬀ ” cycles

(due to a lower boiler temperature) also reduce fuel consumption.

In addition, the room comfort level is signiﬁ cantly increased by

matching the heat output to the current heat loss. Less room

temperature ﬂ uctuation is realized. System noise caused by

expansion of piping is signiﬁ cantly reduced due to lower system

water temperatures.

Constant circulation zone: A constant or continuous circulation

zone is just what the term implies, water continuously circulates

through a given zone when the heating system is in operation.

The water temperature in this zone is modulated so that the heat

output from the distribution units (i.e., ﬁ n-tube baseboard, panel

radiators, radiant ﬂ oors, etc.) matches the rate of heat loss for that

zoned area. A constant circulation zone is typically the main

heating zone. In multi-zone systems, the constant circulation zone

must require the highest system water temperature. With this

method of controlling, a room sensor is required in order to

monitor room temperature. All secondary zones will have standard

room thermostats to intermittently operate a zone valve or zone

circulator.

The constant circulation zone will only be interrupted under the

following conditions:

• Domestic hot water priority.

• Certain setback modes (See the control Service Manual for

information on various setback modes).

• Condensate protection. If boiler water temperature falls below

the condensate protection temperature while the burner is

ﬁ ring, the space heating circulator(s) will be shut oﬀ . Once the

boiler temperature reaches a safe level, circulator operation

will resume.

• When the outdoor temperature rises above the WWSD (warm

weather shut down) setting.

WWSD: Warm weather shut down or summer-winter changeover,

is the outdoor air temperature at which the space heating function

of the system shuts down. With the Buderus control system this

temperature is adjustable from 49°F to 87°F (9°C to 31°C). When

the outdoor temperature rises above the WWSD set point, the

system will only operate for domestic hot water production. (For

detailed operation of the WWSD feature refer to the control

Service Manual).

BFU Room sensor: The Buderus room sensor is similar to a

thermostat although it will not turn a circulator on or oﬀ . The

function of the room sensor is to continually monitor room

temperature and relay this information back to the control system.

This information is used to compensate for variations in room

temperature due to internal heat gains (or losses) such as solar

gain, ﬁ replaces, wood stoves, appliances, lighting, people, open

doors or windows, etc. The control compensates for these

variations by adjusting the system water temperature (up or down)

in order to maintain the desired room temperature. Buderus room

sensors also allow the occupant to manually override

programmed setback periods.

The control system allows you to limit the amount of

compensation that the room sensor has over the selected

heating curve. This setting is referred to as “ROOM COMP” and

can be adjusted at the programming level of the control. This

setting is only available when using a room sensor.

You may want to limit compensation if secondary zones are under

radiated.

Example: The main heating zone (continuous circulation) zone is

experiencing solar heat gain. The room sensor senses the rise in

room temperature and lowers the system water temperature in

order to keep the zone from over heating. In this scenario, the

system water temperature could be lowered enough so that the

output from a secondary zone was insuﬃ

cient to satisfy that zone.

Only one Buderus room sensor can be used for high temperature

space heating (a second room sensor can be added when using

an FM241 module for motorized mixing of a lower water

temperature).

Careful consideration must be given to placement of room

sensors. Keep in mind that not all applications are suitable for

using a constant circulation zone. Avoid using a room sensor in a

small baseboard zone as overheating may occur during DHW

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production. A standard room thermostat can be used in

conjunction with the room sensor to give high limit protection.

Setback: Buderus reset controls allow the occupant to program

setback periods in order to further reduce operating costs.

Several modes of setback can be selected with the Buderus

control. The two modes used for residential applications are

“SETBACK” and “RMSETBACK”. Unlike conventional

setback thermostats that only reduce the zone temperature

setting, the Buderus control system will operate the boiler at a

reduced water temperature. For example, at a 30°F (-1°C)

outdoor temperature the boiler water temperature may be 145°F

(63°C), at that same 30°F (1°C) outdoor temperature during a

setback period, the boiler water temperature may be reduced to

130°F (54°C).

This further reduction of water temperature will decrease the

output from the radiators by lowering the room temperature in

the living space. The extent to which the water temperature is

reduced is dependent upon the desired room temperature

reduction during setback periods. This value can be set in one

of two ways:

• SETBACK mode - a “DAYTEMP” and a “NIGHTTEMP”

would be entered on the Buderus control (this would be

done when you are not using a BFU room sensor)

• RMSETBACK mode - when using a BFU room sensor, the

room sensor allows you to select the amount of room

temperature setback.

Allowance for pick-up time must be considered when coming

out of a setback period. Systems that operate on outdoor reset

will have a longer recovery time than systems that operate at

maximum temperatures all the time. The two variables to

consider are the amount of room temperature reduction

and the length of the setback period. The use of a BFU room

sensor can speed up the recovery time, however the amount of

temperature boost is dependent upon the ROOMCOMP setting

on the Buderus control (for details refer to the control Service

Manual).

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3 Control Programming

The following will allow access to the service side of the control:

1. Push and hold the turn page button " " while inserting

a pen or wire into the hole "

" on the display.

2. The word AMERICAN will be displayed.

3. Turn blue dial once to the right, BLR TEMP will be displayed.

This is a main category.

4. Push and release return button to access sub menu.

FREEZE TEMP will be displayed. If the outdoor

temperature drops beneath the frost protection limit, the

heating system pump (contacts 61/63) will be started.

Factory default: 41°F (5°C).

5. Turn blue dial one more time and BUILD RESP will be

displayed. The current setting will be 2, change that to 1 by

holding the "

" button and turning the blue dial until

you get to the number 1 and release. This will let the boiler

respond faster to outside air temp changes.

6. Turn the dial one more time and PUMPLOGIC will be

displayed. The current setting is 104°F (40°C). This will not

let the burners and the pump run at the same time below

104°F (40°C) to protect from condensation.

7. Turn the dial one more time and MAXTEMP1 will be

displayed. The current setting for this is 176°F (80°C). To

change this to 194°F (90°C), hold down the "

" button

and turn the blue dial until 194°F (90°C) appears, then

release. (this may not be necessary unless under radiated)

8. Now push the return button "

" once.

9. Now you are back to the main categories. Turn the blue dial

once to the right and it will read CIRCUIT1.

10. Push and release the "

" button and REF TEMP will

be displayed which represents the boiler water temperature

at 14°F (-10°C). Default is 167°F (75°C). Refer to page 20

in the service manual for graphing REF TEMP changes.

11. Turn the blue dial one more time and REMOTE1 will appear.

The factory setting is off, and the only time you have to turn

this on is if you are using a BFU room sensor. Use a BFU

room sensor for constant circulation on one zone and power

the pump off of 61 and 63.

Once REMOTE1 setting is turned „on“, the ROOM COMP

parameter will be displayed. Use ROOM COMP to adjust the

room influence on the heating curve.

12. Turn the blue dial one more time and OASETBACK will

appear. Hold the "

" and turn the blue dial to

SETBACK. On the OASETBACK mode, the pumps will

turn off in the night setback mode if the temp outside is

above the freezetemp. In the SETBACK mode the curve

will drop back for fuel savings. If you have a room sensor

and want to do the temp set back by it, you will need to

change it to RMSETBACK.

13. Turn the blue dial one more time and OFFSET will appear.

The setting will be at 0°F (0°C) and is okay with normal

radiation, but if you have an air handler, you will need to

raise the offset to 9°F (5°C). This will raise the beginning of

the curve and supply enough temperature on milder days.

14. Push and release the return button "

" again.

15. Turn the blue dial one more time and DHW PROD will

appear. The factory setting is ON. If no DHW tank is

installed, hold down the "

" button and turn until it says

OFF and release.

16. Turn the blue dial one more time and RECIRPUMP will

appear. The setting is 2, it can be changed to OFF,

1,2,4,5,6,ON. The pump will run 3 minute cycles depending

on the number of cycles you choose per hour. If you do not

have a recirc pump turn it to OFF.

17. Turn the blue dial one more time and HTG CURVE1 will

appear. Hold the "

" button and turn the blue dial. It

will show you three points on the curve so you can see what

the water temp will be at 3 different points, then release.

18. Turn the blue dial one more time and RELAYS will appear.

This will allow you to test all the components that are wired

to the 2107 control.

19. Push the "

" button and BURNER will appear. Hold

the "

" button and turn the blue dial and the LCD will

read ON, release and the burner will start. Hold the "

"

button and turn the blue dial and the LCD will read OFF,

release and the burner will turn OFF.

20. Test the Heating Pump (constant circulation pump),

DHW Tank Pump, and DHW Recirc Pump the same way.

21. When you are done with the RELAY tests push the return

button "

" .

22. Turn the blue dial one more time and LCD-TEST will

appear. To test the LCD display, hold the "

" button

and turn the blue dial, release and it should read

LCD-TEST.

23. Turn the blue dial one more time and RESET should

appear. To reset the control back to factory settings, hold

the "

" button until all of the 8‘s disappear and release.

The first thing you will need to do is go back to the language

and it will read DEUTSCH. Hold the "

" button and

turn the blue dial until you read AMERICAN on the LCD.

The control is now back to factory setting.

Now push the AUT button and you will be back in Automatic

mode.

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US

C

®

This product has been tested and is certiﬁ ed for

both the US and Canadian markets and meets all

applicable US and Canadian standards.

Notice:

To match the typical building, the following factory settings may

need adjustment:

BLDG RESP: Change to 1 if typical 2x4 or 2x6 construction

MAX TEMP: Change to 185-190°F if high temperature

baseboard is used

OASETBACK: Change to SETBACK if no room sensor is being

used or

RMSETBACK: if a room sensor is present

Refer to page 10 for additional details.

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4 Installation of the Logabracket

The Logabracket is designed to create strain relief for your line

voltage and low voltage wiring for the 2107 Logamatic controls.

The bracket is mainly designed for use with the G115, G125,

GB125 and G124X boilers, but with minor modiﬁ cations can be

used on other boiler models as well.

G115, G125, GB125, G124X

Line the bracket up with holes, place the Logamatic in place

over the holes and secure with screws provided. Four conduit

connections are provided for line voltage wiring; a slotted

opening is used to run low voltage sensor wiring.

G215

It is necessary to bend down the tabs on the rear jacket panel

to prevent interference between bracket and jacket panel.

G234X, G334X

Simply cut oﬀ the tabs of the bracket and mount on the rear

panel by drilling an additional hole for a second mounting screw.

GA124, GA244

These boilers do not require the bracket as strain relief

connections are provided on the rear of the boiler.

Figure 1 Logabracket installation

1 Logabracket

2 2107 Logamatic control

3 Screws

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5 Setting parameters and display

data for the Logamatic 2107

Display

AMERICAN Language selection

BOILER Boiler parameters

FREEZE TEMP Freeze protection limit

BUILDING Building response

2-STAGE1 Burner type¹

MIN MOD² Minimum modulation output²

TIME RUN² Minimum burner run time²

PUMPLOGIC Pump logic threshold

MAX TEMP Maximum boiler switch-off temperature

CIRCUIT 01 Heating circuit 1 installation parameters (unmixed heating circuit)

PERIM HTG Heating system

REF TEMP Design temperature

REMOTE 1 Remote control ON/OFF

ROOM COMP Room temperature compensation³

OA SETBACK Type of setback

OFFSET Room temperature offset

CIRCUIT 02 Heating circuit 2 installation parameters (mixed heating circuit)4

FLOOR HTG Heating system

REF TEMP Design temperature

DHW PR5 DHW priority⁵

MAX TEMP Maximum heating circuit temperature

REMOTE 2 Remote control ON/OFF

ROOM COMP Room temperature compensation³

OA SETBACK Type of setback

OFFSET Room temperature offset

Note: For footnotes, see next page

+

Press the ‘Display’ key and ‘Install’ key at the same time to call up the

service level. Alternatively press (1....7), clock, and return arrow button

simultaneously. See Chapter 3 for extended functions.

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Display

SOLAR

7

SLR FN ON Solar function ON/OFF

MAX SL SR Maximum storage tank temperature in solar mode

MIN SL SR Minimum storage tank temperature in solar mode

DHW PROD Domestic hot water ON/OFF

RECIRC PUMP⁵ DHW circulation pump⁵

HTG CURVE 1 Heating characteristic curve HK1

HTG CURVE 2⁴ Heating characteristic curve HK2⁴

RELAYS Relay test

BURNER (St.1) Burner relay stage 1

BURNER21, MOD2² Burner relay¹ stage 2, modulation output²

HTG1 PUMP Heating circuit pump (HZ1 unmixed)

HTG2 PUMP4 Heating circuit pump (HZ2 mixed)⁴

MIX VALVE4 Mixer

4

DHW PUMP Tank DHW pump

RECIR PUMP DHW circulation pump

SLR PUMP

⁷ Solar pump⁷

LCD TEST LCD test

TIME Time, accuracy

RESET Reset

VERSION Version number

1 Only if the FM 242 module is installed and 2-stage burner is selected.

2 Only if the FM 242 module is installed and modulating burner is selected.

3 Only if BFU remote control is installed.

4 Only if the FM 241 module is installed.

5 Only if DHW is installed.

6 Only if FM 241 module is installed and if heating circuit 2 is selected as an "FLOOR HTG" or "PERIM HTG" heating system.

7 Only if FM 244 module is installed.

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6 Troubleshooting

6.1 "NO HEAT" call

ZM1

LT GRY

“BRENNER” (burner) wiring block

– Terminal 4 – 120V Neutral

– Terminal 8 – 120V input clocks hours run meter

(must be ﬁ eld wired)

– Terminal 9 – 120V input displays “BURNER ERR”

message (must be ﬁ eld wired)

– Terminal 10 / 11 – “dry” contacts close to energize

burner

– Terminal 12 – 120V power (drops out when manual

reset limit is tripped)

Burner operation

The R2107 is not a cold start control. It does not reply on a call

for heat from an end switch or thermostat to ﬁ re the boiler.

The boiler will maintain a range of water temperature based on

outdoor temperature. The diﬀ erential of this range is dynamic,

meaning that it is not ﬁ xed, and will adjust based on outdoor

temperature and current system load. The starting point of the

diﬀ erential is 27°F (15°C) and will adjust from there. The

diﬀ erential will generally be wider at milder outdoor

temperatures and narrower at colder outdoor temperatures.

The diﬀ erential is split above & below the current target

temperature.

Example: Outdoor temperature at 32°F, based on heating curve

the water temperature required is 140°F with a 26°F burner

diﬀ erential.

The diﬀ erential (26°F) is split (13°F) above & (13°F)

below the target temperature.

140°F target + 13°F = 153° high limit

140°F target - 13°F = 127° low limit

This 127°F to 153°F becomes the range of temperature that the

boiler will maintain. As zones call and pull heat from the boiler,

eventually the temperature in the boiler drops. Once the

temperature in the boiler hits the low limit (127°F) the R2107

control closes a switch (dry contacts) between terminals 10 & 11

to ﬁ re the boiler (this is indicated by a ﬂ ame symbol displayed

on the LDC screen of the R2107). When the boiler temperature

reaches the high limit (153°F), the contacts open and the boiler

stops ﬁ ring.

Once the outdoor temperature drops below the WWSD setting,

the boiler begins to maintain temperature. Above WWSD the

boiler will only ﬁ re on a call for DHW.

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ZM1

LT GRY

Oil burners – factory jumper between terminals 12 & 10, brings

120V from 12 to 10. When contacts close between terminals 10

& 11, 120V power is sent from terminal 11 to Hot on the burner

(terminal 4 is the neutral).

Gas burners – remove factory installed jumper between

terminals 10 & 12. The contacts between terminals 10 & 11 are

now “dry” (no voltage present) and switching to the burner is

now low voltage between terminals 10 & 11 on the R2107 and

TT (or RW) on the boiler aquastat.

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18

11

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6.2 "INSUFFICIENT HEAT" call

A call for insuﬃ cient heat is generally a simple matter of adjusting

the heating curve.

The water temperature required for any heating system is

determined by any number of factors but the biggest inﬂ uence we

see is the amount of radiation in comparison to the actual heat

loss. Buildings with less radiation in relation to their actual heat

loss require higher water temperature than buildings that are

overradiated. Every house is unique in terms of it’s heat

requirements. Some of the many factors include, construction,

exposure to sun, elevation, surroundings (trees, other structures,

etc), furnishings, internal heat gain (computers, lights, people,

appliances, etc) and the expectations and comfort level of the

individual.

The heating curve on a R2107 can be adjusted in several

ways:

REF TEMP – the reference temperature adjusts the slope of the

heating curve. The REF temperature in the R2107 references a

boiler water temperature at 14°F outdoor temperature. In general,

if the homeowner complains that they can never get the house up

to temperature, adjust the REF temperature up. A rule of thumb

would be: for every 1°F you want to raise the room temperature,

increase the REF temp by 2.5°F.

For example: Customer says they can’t get the house above 65°F.

We need to increase the room temperature by 5°F

…5 x 2.5 = 12.5.

You would increase the REF temperature by 12 or 13°F. The

default setting in the R2107 is 167°F REF temperature.

OFFSET – the OFFSET setting is used to raise the starting water

temperature of the system. Another way to say this is, raising the

OFFSET setting will give you higher water temperature at milder

outdoor temperatures. Common applications for adjusting the

OFFSET setting include, hydro-air, fan coils, unit heaters, etc.

These types of heating units typically require some amount of

minimum water temperature. Occasionally, you may have a call

for insuﬃ cient heat but only in milder weather. Even with ﬁ n-tube

radiation, cast-iron radiators or panel radiators. With this type of a

call, you will want to increase the OFFSET setting.

USE THE QUICK REFERENCE GUIDE FOR INITIAL

PROGRAMMING

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6.3 "NO DHW" Call

ZM1

LT GRY

A “DHW PROD ERR” message will appear on the LCD screen

of the R2107 control with regard to domestic hot water

production.

DHW ERR - when the tank temperature drops to the low limit

(7°F below the set point), the R2107 goes into DHW priority

mode.

The R2107 will learn through its own adaptive software

intelligence the required temperature needed in the boiler to

satisfy a call for domestic hot water. During DHW priority, it

interrupts power to the space heating circuit {terminals 61 & 63)

before the tank setpoint is reached and energizes the DHW

pump circuit {terminals 24 (N) & 25 (H)} to purge the generated

heat in the boiler into the indirect tank. The pump circuit symbol

is displayed on the LCD screen during DHW operation.

The purpose of the R2107 intelligence is such that it is designed

to operate the burner for the least amount of time to satisfy

DHW and return the boiler back to its required heating

temperature level.

In DHW priority, if the R2107 does not sense a rise in DHW

temperature in 30 minutes, it will display a DHW PROD ERR

message. The DHW PROD ERR will also be displayed if the

tank is not satisﬁ ed within 2 hours.

At this point, the control will go back to space heating mode and

lock out the DHW to avoid freezing the building. This message

is general in nature and the R2107 control is essentially telling

you, “I tried to make domestic hot water but nothing happened”.

IN MOST CASES THE PROBLEM IS NOT WITH THE R2107

CONTROL. To rule out the R2107, turn power oﬀ to the R2107

to reset.

The R2107 will again try to make DHW. Check terminals 24 &

25 for 120V. If power is present and boiler ﬁ res the R2107 is

o.k.

Check the following:

1 - bad circulator

2 - stuck ﬂ ow check

3 - piping is air bound

4 - closed valve

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7 Description of wiring

terminals

ZM1

LT GRY

Line Voltage (120V) Connections:

White (ZM 1 ) Constant 120V power:

Used to supply line voltage power when using optional module FM241. The wiring harness on the

FM241 module plugs into this block.

White (Netz) Power input:

Connect 120V power source to L and N using 10 amp in-line fuse provided.

Orange (SI) Safety connections:

Terminals 17 and 18: There is a factory-installed jumper berween terminals 17 and 18. This jumper

must stay in place unless a dry contact Low Water Cutoﬀ , CO-detector or similar

safety device is used. When using such a safety device, remove the jumper and

connect the normally closed contacts to terminals 17 and 18. On 24V devices

connect the dry contacts to 17 and 18.

NOTE: cutting this circuit will disrupt power to the burner, but keep the controls

and heating system powered.

Terminal 19: When the manual reset high-limit trips, terminal 19 puts out 120V for alarm

signal (alarm provided by others).

Green (Brenner) Burner connection:

Terminal 4: Common neutral

Terminal 8: Requires 120V input to operate the hours run meter

Terminal 9: Requires 120V input to display burner error

Terminal 10 and 11: Dry contact closure for burner ﬁ ring

Terminal 12: Constant 120V voltage. Power from manual reset high limit

(See section 9 of this manual for application wiring diagrams for burner circuit)

Yellow/Blue (UE) Flue gas testing:

Used on GB125. Do not remove factory installed jumper between terminals 2 and 3.

Green (HK- I ) Space heating circuit # 1 :

120V power output on terminals 61 and 63 for space heating pump(s). Not to exceed 5 amp draw. If

multiple space-heating pumps are used, refer to speciﬁ c application wiring diagrams provided in this

manual (section 8).

Grey (PS) Domestic water circulator:

120V power output on terminals 24 and 25 for DHW production.

Purple (PZ) Domestic water recirculation pump:

120V power output on terminals 13 and 14 for DHW recirculation.

Note: Power to terminals 61 and 63 are interrupted when the system is in domestic water production. Therefore, there will

never be power on terminals 24/25 and 61/63 at the same time, while operating in automatic mode

18

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018

Technical speciﬁ cations are subject to change without prior notice

ZM1

LT GRY

Sensor Connections (Low Voltage):

Brown (BF) BFU room sensor-circuit #I:

Connect BFU room sensor (circuit #1) using 18-2 AWG wire. Connections are polarity sensitive, terminal

1 must be wired to terminal 1 on room sensor, etc. Wiring can be run up to 500’ from control.

Light Gray (FB) Domestic tank sensor

The FB tank sensor and terminal plug are supplied with the control. For SU and ST series tanks the FB

sensor is inserted into the immersion well in the tank. For L and LT series the sensor is surface mounted

on the front of the tank using the bracket provided on the tank. Sensor wire can be extended if

necessary, using 18 AWG wire.

Green (FK) Boiler sensor:

The FK sensor comes pre-wired to the terminal block and bundled together with two capillaries. This

sensor bundle is inserted into the chrome well provided. (refer to control Service Manual for well location

for speciﬁ c boiler model)

Blue (FA) Outdoor sensor:

The outdoor sensor is a thermistor-type sensor protected by a UV resistant enclosure. The outdoor

sensor should be installed on the North/Northeast side of the building, out of direct sunlight. Mount the

sensor at a height where it cannot be tampered with or aﬀ ected by snow accumulation. Run 18-2 AWG

wire to the outdoor sensor up to 300’ in length. Avoid running wire parallel to telephone or line voltage

wires.

Applications manual

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018 Technical speciﬁ cations are subject to change without prior notice

Optional modules:

FM241 Mixing module

Brown (SH/PH-HK2) Mixing and Space heating circuit #2:

Terminal 41 Power input for mixing motor

Terminal 43 “OPEN” output to mixing motor

Terminal 44 “CLOSE” output to mixing motor

Terminals 61/63 Power output for circuit #2 pump(s) (2 amp max)

(refer to section 7 of this manual for detailed wiring information for FM241)

Brown (BF) BFU room senor-circuit #2

Connect BFU room sensor (circuit #2) using 18-2 AWG wire. Connections are polarity

sensitive, terminal 1 must be wired to terminal 1 on room sensor, etc. Wiring can be run up to

500’ from control.

Light Brown (FB) Mixed circuit sensor:

The FB sensor and terminal plug are supplied with the FM241 module. The FB sensor is

strapped onto circuit #2 piping, for sensing of the mixed water temperature mount to piping

using the spiral spring and clip provided and cover with pipe insulation. The sensor leads can

be extended if necessary, using 18-2 AWG wire.

Wiring Harness Power Supply:

Connect the wiring harness attached to the FM241 module (brown, blue, and yellow/green

wires) to wiring block ZM 1 on the control.

FM242 Staging Module

White Terminal 36 Not used.

Terminal 37/39 Dry contact closure for ﬁ ring of stage 2.

Terminal 38 Output signal for modulating burners only.

(refer to section 9 of this manual for detailed wiring information for FM242)

FM244 Solar Card

PSS Solar pump GND

61 N

63 L

FSK Terminal 1/2 Collector sensor

FSS Terminal 1/2 Tank bottom sensor

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Logamatic 2107 Controls

Applications Manual

Logamatic 2107 Controls applications manual | 06.2018

Technical speciﬁ cations are subject to change without prior notice

8 Application drawings

Description (page#)

Single temperature systems

8.1 Single Zone Space Heating with panel radiators (constant

circulation)/Indirect DHW Heating (page 22)

8.2 Single Zone Space Heating/Indirect DHW Heating (page 24)

8.3 2-Zone Space Heating with BFU and 1 thermostat (with

constant circulation zone)/Indirect DHW Heating (page 26)

8.4 Multi-Zone Space Heating/Indirect DHW Heating (page 28)

8.5 Multi-Zone Space Heating using Zone Valves (with constant

circulation zone/Indirect DHW Heating (page 30)

8.6 Multi-Zone Space Heating using Zone Valves/Indirect DHW

Heating (page 32)

Multi-Temperature Systems

8.7 Multi-Zone High Temp Space/Radiant Floor Heating with

FM241 module & Motorized Mixing Valve/Indirect DHW

Heating (page 34)

8.8 Multi-Zone Radiant Floor Heating with FM241 module and

Motorized Mixing Valve/Indirect DHW Heating (page 38)

8.9 Parallel Boiler Piping with FM242 Module / Indirect DHW

Heating (page 42)

8.10 Dual Boiler / Primary/Secondary Piping with FM242

Module / Indirect DHW Heating (page 45)

8.11 Multi-Zone Space Heating/On-demand High Temp Heating/

Indirect DHW Heating (page 48)

Boiler/Burner Wiring

In order to simplify electrical application drawings, boiler/burner

wiring has been omitted from this section. Detailed wiring

schematics for oil burners, G124X, G234X and G334X gas

boilers are located in section 9.

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Buderus Logamatic 2107 Applications Manual

Buderus Logamatic 2107 Applications Manual

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